Andrew Braybrook on X: "Here are my two trusty calculators from the `80s. Both still working, both do hex. Might even be the original battery in the fx-570. I bought the solar-powered
Casio fx-602P from 1981 - The best calculator Casio ever made? - YouTube
Casio CASIO calculator 12 digits orange mini just type MW-C20C-RG-N - Walmart.com
CALCUSEUM(XL) CASIO: FX78
Mr. Pen- Scientific Calculator, Solar Power, 2 Line Calculator - Walmart.com
Amazon.com : Casio DJ-120D Business Desktop Calculator with Check & Correct, Black : Financial Calculators : Office Products
Amazon.com: Casio Fx-cg50-ih Color Graphing Calculator : Office Products
Casio FX115ESPLUS Scientific Calculator - Hard Case, Auto Power Off, Dual Power, Textbook Display - 4 Line(s) - 16 Digits - Battery/Solar Powered - 1 - 1" x 3.3" x 6.5" - White - 1 Each - Thomas Business Center Inc
Amazon.com: Casio Fx-82es Fx82es Plus Bk Display Scientific Calculations Calculator with 252 Functions : Office Products